9866261 has 2 divisors, whose sum is σ = 9866262. Its totient is φ = 9866260.

The previous prime is 9866243. The next prime is 9866291. The reversal of 9866261 is 1626689.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7672900 + 2193361 = 2770^2 + 1481^2 .

It is a cyclic number.

It is not a de Polignac number, because 9866261 - 2¹⁴ = 9849877 is a prime.

It is a super-2 number, since 2×9866261² = 194686212240242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9866291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4933130 + 4933131.

It is an arithmetic number, because the mean of its divisors is an integer number (4933131).

Almost surely, 2^9866261 is an apocalyptic number.

It is an amenable number.

9866261 is a deficient number, since it is larger than the sum of its proper divisors (1).

9866261 is an equidigital number, since it uses as much as digits as its factorization.

9866261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 9866261 is about 3141.0604897073. The cubic root of 9866261 is about 214.4787154926.

The spelling of 9866261 in words is "nine million, eight hundred sixty-six thousand, two hundred sixty-one".